NUCLEAR MAGNETIC RESONANCE METHOD AND LOGGING APPARATUS
A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is moveable through the borehole; (b) producing, from the logging device, a static magnetic field in the formations; (c) transmitting, into the for...
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Main Authors | , , , |
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Format | Patent |
Language | English French German |
Published |
04.09.2002
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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Abstract | A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is moveable through the borehole; (b) producing, from the logging device, a static magnetic field in the formations; (c) transmitting, into the formations, from the logging device, a magnetic pulse sequence and receiving, during the pulse sequence, magnetic resonance spin echo signals; the magnetic pulse sequence having a portion of a pulse acquisition sequence with relatively long pulse spacing times tE,1 and another portion of the pulse acquisition sequence with relatively short pulse spacing times tE,2; and (d) repeating step (c) with pulse spacing times tE,2 that are different than tE,2;(e) deriving respective T2 distributions from the spin echo signals obtained during the another portion of the pulse acquisition sequence of step (c) and during the another portion of the pulse acquisition sequence of step (d); and (f) determining the characteristic of the formations from the respective T2 distributions. |
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AbstractList | A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is moveable through the borehole; (b) producing, from the logging device, a static magnetic field in the formations; (c) transmitting, into the formations, from the logging device, a magnetic pulse sequence and receiving, during the pulse sequence, magnetic resonance spin echo signals; the magnetic pulse sequence having a portion of a pulse acquisition sequence with relatively long pulse spacing times tE,1 and another portion of the pulse acquisition sequence with relatively short pulse spacing times tE,2; and (d) repeating step (c) with pulse spacing times tE,2 that are different than tE,2;(e) deriving respective T2 distributions from the spin echo signals obtained during the another portion of the pulse acquisition sequence of step (c) and during the another portion of the pulse acquisition sequence of step (d); and (f) determining the characteristic of the formations from the respective T2 distributions. |
Author | FLAUM, CHARLES FLAUM, MARK VENKATARAMANAN, LALITHA HURLIMANN, MARTIN, D |
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DocumentTitleAlternate | METHODE FÜR MAGNETISCHE KERNRESONANZMESSUNGEN UND BOHRLOCHMESSGERÄT PROCEDE DE RESONANCE MAGNETIQUE NUCLEAIRE (RMN) ET APPAREIL DE DIAGRAPHIE |
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Snippet | A method for determining a characteristic of formations surrounding an earth borehole, includes the following steps: (a) providing a logging device that is... |
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SubjectTerms | DETECTING MASSES OR OBJECTS GEOPHYSICS GRAVITATIONAL MEASUREMENTS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES PHYSICS TESTING |
Title | NUCLEAR MAGNETIC RESONANCE METHOD AND LOGGING APPARATUS |
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